Question

3. (50) Two different pure-breeding plants were crossed and F1 gave a wild-type which was test-crossed. The following numbers were obtained for F2, focusing on three unusual characteristics: height of the plant, color of the flower, surface of fruit: 150 completely wild type; 122 small, white, rough; 571 white, rough; 603 small; 36 rough; 29 smal, white; 4 white; 5 small, rough. a. What were the genotypes of the parental lines? b. Draw a linkage map for the three genes (include map distances). c. Calculate the interference value. d. Position additional gene X on a linkage map, which is known to be 9.5 cM apart from the gene for the height of the plant

genetics problem

Answer 1

(3) Three chaacistes taken into account ght the /; color of the oun(Wilw owen Sutace rn which e So the parent mt be hom Kece ive }ene.ahon, b)。c&From", F よffeAe n ț he netylu ouuS no. p Ae.ble 아 Possble Qeno Crossingov 15o e LNo Small, white, ough 7 CYoss 4 J R T4W ← Small over 5 Double reu Smal over Tolal: 150 CToSs ahenS The different combinations of charaudeiskes n F åse due J- CYoSSinq oves Stance owe人 be no. of cross- ove between T W Total no. of 5 1183O.tzg Mo 1530

istanebetween S20 15 10 4.8 Cenk Morgan So, a Jinkege ma can be draun as, 4.8cM キキ. 8 CM C) Observed fegueny of CrossRng over beんeen Tew was , behwen 4 R was,0.048 So the ereched feueny of double Crossoe t ntava e exPec uene, of double cress over bchveen the T R d, Obsenved O.005 520 cross- ove befucen ouble en the Yegion. omuch len than expeded This means one cossover ankk the occuhne nce of anotheγ neand inudence (c obseavedl freguen ofdouble cross-oveu Exbeakdldouble crass- oves 0.00S 10030 13s O. 037 (1-0-13s)-O-8 (T)-1-c "intaf level of The ehence ㄙ 1.8cM 4.8cM 9.5 CM